Pencil-sharpening device.



H. GANS.

PENCIL SHARPENING DEVICE,

APPLlCATlON man MAR. 29. 1911.

1,234,652 Patented July 24, 1917. v

2 SHEETS-SHEET all) m'ZizesSes:

R. GANS.

PENCiL SHARPENING DEVICE. APPLICATION FILED PAH-29.1917.

11,234,652. Patented July 24,1917

2 SHEETS-SHEET 2- 46- 48 a; 1 g. 8. /a/

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UNITED STATES PATENT OFFICE.

ROBERT Gains, on NEW YORK, any. 7

PENGIL-SI-IARPENING nEvIcE.

To all whom it may concern:

Be it known that I, ROBERT GANs, a citizen of the United States, and a resident of the borough of Manhattan, city, county, and State of New York, have-invented certain newand useful Improvements in Pencil- Sharpening Devices, of which the following is a specification.

f My improvements relate to the class of pencil sharpeners in which .the pencil is rotated in its longitudinal axis while subjected to-the action of the cutting blades; and my object is to afford a simple, cheap yet effective and substantial structure adapted to the requirements of general use,the invention consisting in the specific construction and arrangement of parts described and claimed; and the distinctive features being the formation of several parts in one piece with the standard plate; the cutter disk with blades and chuck gearactuating lugs integral therewith; and the peculiar formation of the rotatable pencil chuck, all as hereinafter fully set forth.

. In the accompanying drawings, Figure 1, 1s a front vlew of my lmproved pencil sharpening device;

Fig. 2, is a rear view thereof; Fig. 3, is a top view thereof; Fig. 4:, is a side elevation thereof; .Fig. 5, is a horizontal sectional elevation taken upon plane of line 55, Fig. 1; Fig. 6 is an elevation of the hub piece. Fig. 6 is an end view thereof. Fig. 7 is a vertical sectional elevation taken upon plane of line 77,' Fig. 1;

Fig.8, is a view of the standard plate blank before folding into shape; Fig. 9, is a view of the inner or rear side of the cutter disk;

Fig. 10, is a sectional elevation of the pencil rotating chuck and ad acent parts, taken upon plane of line 1010, Fig. 2; V Fig. 11 is an end view of the clutch gear. Fig. 11 is an end elevation of its sleeve. Fig. 11 is a side view thereof.

Fig. 12 isan end elevation of the sprlng bushing. I Fig. 12 is a side view thereof. j'lhe basic structure is the standard plate I A,'fo rmed of suitable sheet metal shaped by dies m a manner well known in the arts. The blank of this standardplate' A, is shown in Fig. 8, .before certain parts of it are bent over into operative position. Thus the triangular side extensions a, a, of the main Specification of Letters Patent.

Patented July 24, 191 7.

Application filed March 29, 1917. Serial No. 158,161.

plate or standard A, arefolded over at sub: stantially right angles thereto to form abutments which sustain the saidmainplate A, rigidly and reinforce it against the strain of use,the feet a, a, a',being also bent over at right angles to. the standard I A, and formed with holes to facilitate attachment to a suitable base by means of screws'or other securing devices. The wing a is formed with the conoidal concavity a which constitutes the pocket for the support of the end of the pencil to be sharpened,+-said wing a being bent over against the rear side of the standard A, with its said conoidal concavity a in axial alinement with that of the center of the aperture at, which extends through the'standard plate and forms with the concavo-conoidal pocket-a the lower partof the cavity a being indented, as shown at at so as to be readily inserted in the apex of the opening (1 the matrix in which the end of the pencil is rotated while 7 subjected to the action of the cutting blades 03, on the rotatable disk D. I

a is the horizontal slot-through which the teeth of the chuck gear a, prortude; and a, a", are vertical slots through which the hook-lugs s, s, of the shavings cup orreceptacle S, protrude,the said hook-lugs 8, s, engaging with the lower end wallsof said slots a, a. (1?, a, represent rivet holes, and a a 'inturned rivet studs upset from the standard plate A, and to. be used in lieu of extraneous rivets or similar attaching devices in securing. the adjunctive parts rigidly to'the standard. a", a", are spacing lugs upset from theplateA, for the lateral sup- I port and alinement ofthe inner face of the cutter disk D, when the latterjis mountedin position on the standard A;-and, the extensionam, is bent over the face of the standard plate A, to laterally support and alinethe outer face of said disk D,' the spacing lugs a", a and this bearing arm a, acting in conjunction to limit and prescribe the plane of rotation of said cutting disk D, both the bearing arm a, and the lu a ao,'ibeing rigid, soas to positively prevent lateral deflection of the disk D, and hold the cutting blades true to their work.

The chuck member C; is mounted in a bearing B, attached to the rear face of the standard plate A, at an angle with relation thereto, the side flanges b, b, of'said bearing being preferably secured to the plate A,Iby

means of rivet studs c5, 0: upset from i plate as before stated. The axis of the clutch member C, coincides with that of the matrix 0 a below; and the inclination of these axes from the plane of the standard plate A, is equivalent to that of the conoidal point to beimparted to the pencil. The inner wall'of the concavo-conoidal pocket 04 extends down to the inverted apex 'or acute angle of the aperture (0*, thus affording ample, secure and uniform support for the exposed central core of plumbago and reinforcing and sustaining the same against the thrust of the cutting blades, so that if said graphite core is of fairly good quality there will be no danger of breakage or rup ture thereof during thesharpening operation. In other words a continuous, unbroken support is afiorded to the end of the pencil point by the pocket a as opposed to the action of the cutting blades, so that the exposed graphite core is effectually reinforced and sustained against the strain in volved in reduction by the cutting blades.

In order to attainthis result the floor of the ocket a is, extended through the aperture to the front surface of the standard plate A, as shown in Figs; 5, and 10.

The rotatable chuck member C, consists of the spur wheel or gear 0, the gear hub or sleeve 0, and the spring bushing 0 The gear 0, is recessed as at c", to receive radial lugs c, on the upper end of the sleeve 0, and the latter is in turn recessed, as at 0, to receive radial lugs 0 on the upper end of the spring bushing 0 The recesses 0*, c', and the lugs 0", 0 are preferably of dove-tail shape, and the lugs are peened tightly within the recesses, so as to afford a permanent connection. By this means the parts of the rotor C, maybe rigidly secured together in a simple, cheap and effective manner. The lower extremity of the bushing 0 extends below the sleeve 0, and is split into a series of bent spring jaws 0 which grip the pencil firmly so that it will rotate with the clutch against the resistance afforded by the cuttingblades.

The rotatable cutting disk D, is formed of a single piece of suitable sheet metal stamped into shape with a plurality of equidistant tangential blades (Z, (Z, upset therefrom, three of these blades being shown in thedrawings. The protuberant inner edges of theseblad'es are sharpened to form cutting edges which trim the end of a pencil inserted in the matrix a ed. The disk is also formed with theupset and inturned spurs or lugs d, d, which, when the disk is rotated contact successively with the teeth of the chuck gear a, to rotate the chuck. Three ofthese chuck gear actuating lugs cl, are shown in the drawings as positioned, relatively as to direction of motion, behind the cutting blades, so as to turn the chuck and pencil slightly between each cut to present fresh surfaces of pencil to the blades successively. The blades (Z, d, acting at an angle as related to the axis of the matrix a a, tend constantly in action to draw the pencil downward farther into the matrix, rendering the device self-feeding to a certain extent, until the perfected point fits and rests in the inverted apex of the matrix, when the cutting edges cease to reach and reduce the pencil point. i

The cutter disk D, is provided with a suitable handle (Z2, and it is mounted upon an axis 6, forming part of the central bearing piece 6, which is also formed with an annular shoulder 6 which fits into the annular opening a, formed for it in the standard A. The main flange of the center piece 0, acts as a washer to space the cutter disk D, apart from said standard; and the axis 6, is slightly greater in width than the thickness' of the disk D, so that the latter may rotate freely thereon. The central bearing piece 6, is hollow to admit the shank of a screw stud -i,the threaded end of which engageswith a nut i, at the rear of the plate, thereby binding the said bearing piece 6, firmly in position on the standard A, without interfering, with the rotation of the cutter disk D, since while the head of the screw confines thedisk D, to its axis 6 it does not impede its rotation because the width of the latter is slightly greater than the thickness of the disk D, as before stated. Thus, also, the cutter disk D,-is free to conform to the alinement prescribed by the.

S')flClI1' lu 's a a and bearin arm a as a: a: a 7 b withstand the strain to which the partsare subjected duringuse. Likewise the making of the pencil pocket or. conoldal concavity a and the bearing arm a 1n one piece with the standard A, is another economical feature; as is also the formation of the cutting blades (Z, and gear-actuating lugs d, in one piece with the disk D. The structure of the rotatable clutch member C, is also simple and inexpensive, the *intcrlocking of the parts as set forth materially reducing the cost of manufacture.

What I claim as my invention andde'sire to secure by Letters Patent is,

1. In a pencil sharpening device of the 7 character designated, a sheet metal standard plate formed with a lateral extension bent over and secured to the main plate, said extension being formed with a conoidal concavity coinciding axially with an aperture in the plate, said aperture and said conoidal concavity constituting the matrix for the pencil, for the purpose set forth.

In a pencil sharpening device of the character designated, a sheet metal standard plate formed with a lateral extension bent over and secured to the main plate, said extension being formed with a conoidal concavity coinciding axially with an aperture in the plate, said aperture and said conoidal concavity constituting the matrix for the pencil, and a rotatable cutting disk mounted in spaced relation to said plate with its blades operable adjacent said concavity.

3. A blank for a pencil sharpening device, the same consisting of a plate having an aperture and a wing with a conoidal concavity, said wing being foldable upon the plate to bring the concavity and the aperture coincident, said plate having a lateral extension to form a bearing arm and triangular side extensions and bendable portions to constitute feet.

4. A blank for a pencil sharpening device, the same consisting of a plate having an aperture and a wing with a conoidal concavity, said wing being foldable upon the plate to bring the concavity and the aperture coincident, said plate having a lateral extension to form a bearing arm and triangular side extensions and bendable portions to constitutefeet, said plate being formed with spacing lugs acting in conjunction with'said bearing arm to limit and prescribe the plane of rotation of a cutting disk.

5. A blank for a pencil sharpening device, the same consisting of a plate having an aperture and a wing with a conoidal concavity, said Wing being foldable upon the plate Copies of this patent may be obtained for-five cents each, by addressing the to bring the concavity and the aperture'coincident, said plate having a lateral extension to form a bearing arm and triangular side extensions and bendable portions to consti-- tute feet, said plate being formed with spacing lugs acting in conjunction with saidbearing arm to limit and prescribe the plane of rotation of a cutting disk, said plate being further formed with a slot for the reception of the teeth of a gear.

6. A blank for a pencil sharpening device,

the same consisting of a plate having an aperture and a wing with a conoidal concavity, said wing being foldable upon the plate to bring the concavity and the aperture coincident, said plate having a lateral extension to form a bearing arm and triangular side extensions and bendable portions to constitute feet, said plate being formed with spacing lugs acting in conjunction with said bearing arm to limit and prescribe the plane 7 of rotation of a cutting disk, said plate being further formed with'a slot for the reception of the teeth of a gear and with slo'ts for the attachment of a shaving receptacle.

7. In a pencil sharpening device of the character designated, a pencil matrix comprising a part formed with a conoidal concavity, and a standard plate formed with an aperture having convergent sides and axially coincident with the said conoidal concavity, the fioor of which extends through said aperture in the standard to the front surface of the latter, together with a rotatable disk having cutter blades in the path of which said aperture is positioned, for the purpose described.

ROBERT eA Nsf Commissioner of Patents,

Washington, D. 6; 

